Hey, I am new here. Just purchased a 2013 FX4 5.0 with 66k and experiencing a groaning that increases in pitch correlated to speed, in drive or in neutral, accelerating or decelerating. I have done a search and came up with a possible diagnosis of clutch packs in the diff..

Does this sound like the most likely cause to everyone? If so how much should I expect this to cost me? Should I go dealer or try to find a rear end shop? I purchased an aftermarket warranty that seems to cover differential however you know how those things work. Thanks in advance guys. Absolutely love the truck.

This website in general is great if you’re new. What were your results?